Worst air pollution Kumamoto, today and tomorrow
Today (16 July): Air quality in Kumamoto is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (O3: 37.9/100).
Tomorrow (17 July 2026): Air quality in Kumamoto is medium. AQI improves to medium; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 12:00 PM (O3: 42.0/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Kumamoto's air quality benefits from its exceptional Ariake Sea and Shimabara Bay coastal position in Kyushu, with consistent Ariake Sea and East China Sea maritime breezes providing reliable ventilation. Vehicle traffic on surrounding expressways and the semiconductor manufacturing, agriculture, and services corridor contribute local sources, while the outstanding coastal exposure and the Aso volcanic highland backdrop create dramatic topographic variation and Kumamoto generally maintains good to moderate conditions for a major Japanese Kyushu coastal city throughout most of the year.
Today - 16 July | Pollution peaks at 16:00
AQI:
Fair
37.9/100
PM2.5 (fine particles):
Good
8.8/100
PM10 (coarse particles):
Good
3.1/100
NO2 (nitrogen dioxide):
Good
8.7/100
O3 (ozone):
Fair
37.9/100
SO2 (sulfur dioxide):
Good
1.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.4/100
PM1 (ultrafine particles):
Good
8.8/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 12:00
AQI:
Medium
42.0/100
PM2.5 (fine particles):
Good
11.8/100
PM10 (coarse particles):
Good
3.8/100
NO2 (nitrogen dioxide):
Good
14.2/100
O3 (ozone):
Medium
42.0/100
SO2 (sulfur dioxide):
Good
2.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.4/100
PM1 (ultrafine particles):
Good
12.8/100
Frequently Asked Questions
Is air quality bad in Kumamoto right now?
On 16 July 2026, overall air quality in Kumamoto is fair. AQI is the main air quality indicator at 37.9/100. Pollution peaks around 4:00 PM (O3: 37.9/100).
Will air quality be worse tomorrow in Kumamoto?
On 17 July 2026, air quality conditions in Kumamoto will be better than today, with AQI forecast at medium at 42.0/100. Pollution peaks around 12:00 PM (O3: 42.0/100).
When is air pollution at its worst in Kumamoto?
In Kumamoto, traffic emissions, manufacturing and food processing, as well as crop farming are the main local sources, with conditions worsening when onshore breezes fall calm. Maritime airflow normally ventilates the area well, though calmer spells let levels rise. This coastal advantage is less pronounced during still, high-pressure weather.
Are air quality levels in Kumamoto based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app